Higher amp alternator?

[J-440]

I have a 140amp right now that's pushing out 14.6 volts at the alternator terminal. After about 5 minutes the fuel pressure gauge fluctuates. And when I turn everything on, the volts drop to 11.5. The car has a FAST EFI, electric fan, electric water pump, electric fuel pump, Halo and LED lights all around (with correct conversion), a Gear Vendors OD, electric windows, and a defroster fan. Am calling Powermaster tomorrow but want to hear what ya'll are running.